<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>02-CSS三种引入方式</title>
    <style>
        .box2{
            width: 200px;
            height: 200px;
            border: green 3px dashed;
            background-color: pink;
        }
    </style>
    <link rel="stylesheet" href="../css/02-CSS三种引入方式.css">
</head>
<body>
<div id="box1" style="width: 100px;height: 100px;border: red 2px solid; background-color:yellow;">我是盒子1</div>
<div class="box2">我是盒子2</div>
<div class="box3">我是盒子3</div>
</body>
</html>